Time

Time is measured on a continuous basis.
Global positioning system satellites broadcast timing signals from their atomic clocks which enable ships, airplanes, trucks, and cars to establish their position.
Whether you are surfing the net or making a phone call, telecommunications rely on accurate timing. The metric unit for time is the second. It is defined in terms of the frequency of vibration of the Cesium 133 atom.
Measuring instruments attempt to duplicate this time period, but vary in their resolutions.